Cortex : Don't build RenderMan components

We don't use these any more - GafferDelight has its own display driver.

Cortex/config.py

@@ -21,8 +21,6 @@
 
 	},
 
-	"requiredEnvironment" : [ "RMAN_ROOT" ],
-
 	"commands" : [
 
 		"scons install"
@@ -31,8 +29,6 @@
 			" CXXSTD=c++{c++Standard}"
 			" INSTALL_PREFIX={buildDir}"
 			" INSTALL_DOC_DIR={buildDir}/doc/cortex"
-			" INSTALL_RMANPROCEDURAL_NAME={buildDir}/renderMan/procedurals/iePython"
-			" INSTALL_RMANDISPLAY_NAME={buildDir}/renderMan/displayDrivers/ieDisplay"
 			" INSTALL_PYTHON_DIR={buildDir}/python"
 			" INSTALL_IECORE_OPS=''"
 			" PYTHON_CONFIG={buildDir}/bin/python{pythonMajorVersion}-config"
@@ -50,7 +46,6 @@
 			" FREETYPE_INCLUDE_PATH={buildDir}/include/freetype2"
 			" WITH_GL=1"
 			" GLEW_INCLUDE_PATH={buildDir}/include/GL"
-			" RMAN_ROOT=$RMAN_ROOT"
 			" NUKE_ROOT="
 			" APPLESEED_ROOT={buildDir}/appleseed"
 			" APPLESEED_INCLUDE_PATH={buildDir}/appleseed/include"
@@ -61,17 +56,13 @@
 			" {extraArgs}"
 			" SAVE_OPTIONS=gaffer.options",
 
-		# Symlink for RenderMan, which uses a different convention to 3Delight.
-		"ln -s -f ieDisplay{sharedLibraryExtension} {buildDir}/renderMan/displayDrivers/d_ieDisplay.so"
-
 	],
 
 	"manifest" : [
 
 		"include/IECore*",
 		"lib/libIECore*{sharedLibraryExtension}",
 		"python/IECore*",
-		"renderMan",
 		"appleseedDisplays",
 		"glsl/IECoreGL",
 		"glsl/*.frag",